Piezoelectric driving type dispensing valve for anaerobic adhesive and working method of piezoelectric driving type dispensing valve

Abstract

The invention discloses a piezoelectric driving type dispensing valve for anaerobic adhesive and a working method of the piezoelectric driving type dispensing valve. A supporting beam is fixed to the upper end of a frame and integrally formed with an arc-shaped reed, an adjusting rod and a displacement amplification mechanism, an adjusting bolt is connected with a threaded hole in the frame and penetrates through a first guide sleeve to make contact with the arc-shaped reed, and a ball firing pin is fixed to the lower end of the displacement amplification mechanism; one end of the base is hinged to the first support, and the other end of the base is fixed to the frame. The flat-head firing pin is arranged under the ball-head firing pin, penetrates through a second guide sleeve on the frame and penetrates into the upper end of a third guide sleeve on the first support. The upper end of the self-resetting firing pin penetrates into the lower end of the third guide sleeve, the middle of the self-resetting firing pin is fixed to the positioning piece through an elastic membrane, the lower end of the self-resetting firing pin is located in a third groove of the second support, and the nozzle is embedded in a fourth step hole formed in the bottom face of the third groove. The mode of changing the stroke of the firing pin does not affect the sealing performance of the spraying cavity, and the adjusting efficiency is high.

Description

Technical Field

[0001] The present invention belongs to the field of dispensing valve design, and particularly relates to a piezoelectric-driven dispensing valve for anaerobic adhesive and its working method. Background Art

[0002] Fluid dispensing technology is involved in production and processing fields such as optics, optoelectronics, semiconductor manufacturing and packaging, and medicine. Piezoelectric stacks have the characteristics of fast response, high resolution, low power consumption, and large output force, and are widely used in dispensing valves. Currently, for a dispensing valve driven by a piezoelectric stack with a plunger, in order to achieve the dispensing of adhesive liquids with different viscosities or different volumes of adhesive drops, it is necessary to adjust the initial stroke of the plunger. However, the existing methods for adjusting the plunger stroke mainly use a nozzle cap to adjust the position of the nozzle to achieve the purpose of adjusting the plunger stroke. The nozzle cap is likely to affect the sealing performance of the spray chamber after frequent adjustment; there are also methods that adjust the plunger stroke by adjusting the position of the plunger, but when adjusting the plunger stroke, it is necessary to pause the dispensing work, and it is necessary to disassemble other parts and unlock the adjustment bolt to achieve the adjustment, which affects the adjustment efficiency; at the same time, the existing method of fixing the nozzle by installing the external thread of the guide ring and the internal thread of the nozzle cap has a low replacement efficiency when the nozzle needs to be replaced. In addition, the components in contact with the adhesive liquid in the current dispensing valve equipment on the market mainly use metal materials, and there is still a lack of structural design for the dispensing requirements of anaerobic adhesives, which limits the application of the dispensing valve. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and propose a piezoelectric-driven dispensing valve for anaerobic adhesive and its working method.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A piezoelectric-driven dispensing valve for anaerobic adhesive of the present invention includes a liquid storage cylinder, a flat-headed plunger, a ball-headed plunger, a piezoelectric stack, a displacement amplification mechanism, a frame, a first guide sleeve, a second guide sleeve, a first fluororubber seal, a nozzle, a third guide sleeve, a base, a first support, an adjusting rod, a circular arc-shaped spring piece, a support beam, an adjusting bolt, a second support, and a self-resetting plunger assembly.

[0006] The displacement amplification mechanism, the adjusting rod, the arc-shaped reed, and the support beam are integrally formed and are all arranged within the frame; the support beam is fixed to the upper end of the frame, and a vertically arranged through hole 1 is provided in the middle of the support beam. Both ends of the arc-shaped reed with a convex arc surface are connected to the support beam, and the middle part is connected to the upper end of the displacement amplification mechanism through the adjusting rod. A ball head striker coaxially arranged with the through hole 1 is fixed to the lower end of the displacement amplification mechanism. A guide sleeve 1 is fixed within the through hole 1, a threaded hole coaxially arranged with the through hole 1 is provided in the upper end of the frame, and a vertically arranged adjusting bolt is threadedly connected to the threaded hole and passes through the guide sleeve 1 to contact the arc-shaped reed. The piezoelectric stack is horizontally arranged within the displacement amplification mechanism, and both ends of the piezoelectric stack are fixed to both sides of the displacement amplification mechanism, and the piezoelectric stack is provided with a pre-tightening force.

[0007] A step hole 1 coaxially arranged with the threaded hole is provided in the lower end of the frame, a support 1 arranged horizontally is detachably fixed to the lower end of the frame, and a step hole 2 coaxially arranged with the step hole 1 is provided in the middle of the support 1. A guide sleeve 2 is sleeved within the step hole 1, a guide sleeve 3 is placed within the step hole 2 and contacts the guide sleeve 2, and the guide sleeve 2 is pressed within the step hole 1 by the guide sleeve 3; the flat head striker is located directly below the ball head striker, and the lower end of the flat head striker passes through the guide sleeve 2 and penetrates into the upper end of the guide sleeve 3, forming a sliding pair with both the upper end of the guide sleeve 3 and the guide sleeve 2, and the upper end is connected to the lower end of the frame through a compression spring 1.

[0008] One end of the base is hinged to the support 1, a step hole 3 is provided in the middle, a groove 1 is provided at the other end, and it is detachably fixed to the frame through a locking mechanism; a support 2 is placed within the step hole 3, and a groove 2 is provided at the upper end of the support 2. A groove 3 is provided at the bottom surface of the groove 2, a step hole 4 is provided at the bottom surface of the groove 3, and a nozzle is fixed within the step hole 4, and a V-ring 1 is provided between the nozzle and the step hole 4. The self-resetting striker assembly includes a self-resetting striker, an elastic diaphragm, and a positioning piece. The positioning piece is placed within the groove 2, the outer edge of the elastic diaphragm is fixed to a round hole 1 provided on the positioning piece, the middle part of the self-resetting striker is fixed to a round hole 2 provided on the elastic diaphragm, the upper end penetrates into the lower end of the guide sleeve 3, forming a sliding pair with the guide sleeve 3, and the lower end is located within the spray chamber formed by the groove 3, the self-resetting striker assembly, and the nozzle. A liquid storage cylinder is fixed to the frame and is communicated with the spray chamber through a glue pipeline. Among them, the arc-shaped reed, the compression spring 1, and the elastic diaphragm are all in a compressed state, the top end of the flat head striker contacts the bottom end of the ball head striker, the top end of the self-resetting striker contacts the bottom end of the flat head striker, and the upper end and the lower end of the displacement amplification mechanism are recessed inward, and the lower surface of the positioning piece contacts the bottom surface of the groove 2; the self-resetting striker is made of ceramic material, the elastic diaphragm and the positioning piece are made of silicone, FKM, FFKM, or EPDM material, and the guide sleeve 2, the support 1, the support 2, and the nozzle are all made of ABS or POM material.

[0009] Preferably, both sides of the assembly composed of the displacement amplification mechanism, the adjusting rod, the arc-shaped reed and the support beam are symmetric about the central axis of the through hole 1.

[0010] More preferably, the connection mode between the base and the frame is as follows: The locking mechanism includes a first pin shaft and a second compression spring. A bracket is fixed to the side of the frame away from the hinge position of the base and the first support by a second fastening bolt, and a first through groove is provided. Second through grooves and third through grooves are provided on both sides of the first through groove, and the third through groove is closer to the bracket than the second through groove. The first pin shaft passes through the first through groove and forms a horizontal sliding pair with the first through groove. The second compression spring is placed in the third through groove, and both ends of the second compression spring are in contact with the first pin shaft and the bracket. A block integrally formed is provided in the middle of the first pin shaft. The block passes through the second through groove and is embedded in the first groove; wherein, the second compression spring is in a compressed state.

[0011] More preferably, the horizontal sliding pair formed by the first pin shaft and the first through groove is replaced with a cylindrical pair formed by the first pin shaft and the first through groove, and the height of the second through groove is greater than the thickness of the block, and the height of the first groove is also greater than the thickness of the block or the bottom of the first groove is open. The block presses against the top wall surface of the first groove, the base presses against the first support, and the second support presses between the base and the first support. Both ends of the first pin shaft are threadedly connected with two nuts, and the side of the nut is provided with an opening which is connected with the cylindrical surface of the first pin shaft by a set screw, and the nut presses against the frame.

[0012] More preferably, two vertically arranged holes are provided on the upper surface of the first support, two second through holes are provided on the frame and are arranged at intervals, and each second through hole is aligned with a vertically arranged hole. The two second through holes are respectively fixed to the corresponding vertically arranged holes by a first positioning pin and a second positioning pin.

[0013] More preferably, the hinge mode between the base and the first support is that the base and the first support form a rotating pair through a second pin shaft.

[0014] More preferably, a convex platform integrally formed is provided on the upper surface of the positioning piece, and a fourth groove is provided on the lower surface of the first support. The convex platform is embedded in the fourth groove to position the positioning piece.

[0015] More preferably, a second fluororubber seal is provided between the flat head striker and the third guide sleeve, and a third fluororubber seal is provided between the first support and the third guide sleeve.

[0016] The working method of the piezoelectric drive type glue dispensing valve for anaerobic glue of the present invention is as follows:

[0017] Inject anaerobic adhesive into the liquid storage cylinder. The anaerobic adhesive flows from the liquid storage cylinder into the spraying cavity through the adhesive pipeline. The piezoelectric stack is alternately powered on and off, causing the piezoelectric stack to deform, driving the upper and lower ends of the displacement amplification mechanism to alternately arch outwards and retract inwards, thereby driving the ball head punch to move reciprocally downwards and upwards. When the ball head punch moves downwards, the ball head punch drives the self - reset punch to move downwards through the flat head punch, contacts the nozzle, and extrudes the anaerobic adhesive in the spraying cavity, so that the anaerobic adhesive in the spraying cavity is extruded from the glue outlet of the nozzle, and at the same time, the first compression spring and the elastic diaphragm are further compressed. When the ball head punch moves upwards, the restoring force of the first compression spring drives the flat head punch to move upwards, so that the top end of the flat head punch is always in contact with the bottom end of the ball head punch. At the same time, the restoring force of the elastic diaphragm drives the self - reset punch to move upwards, so that the top end of the self - reset punch is always in contact with the bottom end of the ball head punch. The self - reset punch separates from the nozzle, and the anaerobic adhesive in the liquid storage cylinder enters the spraying cavity through the adhesive channel to refill the spraying cavity.

[0018] Among them, when adjusting the punch stroke, the adjustment process is as follows: Rotate and screw the adjusting bolt to make the adjusting bolt move downwards or upwards. When the adjusting bolt moves downwards, it pushes the arc - shaped spring piece to be further compressed downwards, and drives the adjusting rod, the displacement amplification mechanism and the piezoelectric stack as a whole to move downwards through the arc - shaped spring piece, and then drives the ball head punch, the flat head punch and the punch body to move downwards synchronously, reducing the distance between the self - reset punch and the nozzle, thereby reducing the stroke of the self - reset punch. At the same time, the first compression spring and the elastic diaphragm are both further compressed. When the adjusting bolt moves upwards, the restoring force of the arc - shaped spring piece drives the adjusting rod, the displacement amplification mechanism and the piezoelectric stack as a whole to move upwards. The restoring force of the first compression spring drives the flat head punch to move upwards, so that the top end of the flat head punch is always in contact with the bottom end of the ball head punch. At the same time, the restoring force of the elastic diaphragm drives the self - reset punch to move upwards, so that the top end of the self - reset punch is always in contact with the bottom end of the ball head punch, thereby increasing the distance between the self - reset punch and the nozzle and increasing the stroke of the self - reset punch.

[0019] Preferably, when the nozzle needs to be replaced, if the pin shaft I and the through groove I form a sliding pair in the horizontal direction, the replacement process is as follows: Pull the pin shaft I to move away from the base, the pin shaft I drives the clamping block to disengage from the groove I, the compression spring II is further compressed, and the end of the base provided with the groove I is unlocked. Then, rotate the base downward, release the pin shaft I, and the pin shaft I drives the clamping block to return to its original position under the action of the restoring force of the compression spring II. Then, remove the self-resetting striker assembly and the nozzle, install the new nozzle into the stepped hole IV, and install the self-resetting striker assembly in place. Pull the pin shaft I to move away from the base, rotate the base upward to its original position, release the pin shaft I, and the clamping block re-embeds into the groove I, thereby completing the replacement of the nozzle; if the pin shaft I and the through groove I form a cylindrical pair, the replacement process is as follows: Unscrew the set screws on the two nuts and loosen the two nuts. Pull the pin shaft I to move away from the base, the pin shaft I drives the clamping block to disengage from the groove I, the compression spring II is further compressed, and the end of the base provided with the groove I is unlocked. Then, rotate the base downward, release the pin shaft I, and the pin shaft I drives the clamping block to return to its original position under the action of the restoring force of the compression spring II. Then, remove the self-resetting striker assembly and the nozzle, install the new nozzle into the stepped hole IV, and install the self-resetting striker assembly in place. Pull the pin shaft I to move away from the base, rotate the base upward to its original position, release the pin shaft I, and the clamping block re-embeds into the groove I, so that the clamping block presses against the top wall surface of the groove I, thereby pressing the base and the support I tightly, and the support II is pressed between the base and the support I. Finally, tighten the two nuts and press them against the frame, and drill holes on the side of the nuts to screw in the set screws.

[0020] The present invention has the following beneficial effects:

[0021] 1. The present invention can change the striker stroke by adjusting the position of the striker, without affecting the sealing performance of the injection chamber, with relatively high adjustment efficiency and nozzle replacement efficiency. Specifically, the present invention realizes that the adjusting bolt can be fixed without applying glue and is not prone to looseness during the dispensing operation through the triple buffering of the arc-shaped spring piece, the first compression spring, and the elastic diaphragm. Therefore, without stopping the dispensing operation to unlock the adjusting bolt, the adjusting bolt can be directly screwed downward, causing the arc-shaped spring piece to push the ball-headed striker, flat-headed striker, and striker body to move downward synchronously through the adjusting rod, displacement amplification mechanism, and piezoelectric stack. The first compression spring and the elastic diaphragm are further compressed, reducing the distance between the self-returning striker and the nozzle. Or the adjusting bolt can be screwed upward, driving the adjusting rod, displacement amplification mechanism, and piezoelectric stack to move upward as a whole through the restoring force of the arc-shaped spring piece, and driving the flat-headed striker and the self-returning striker to move upward respectively through the restoring forces of the first compression spring and the elastic diaphragm, increasing the distance between the self-returning striker and the nozzle, thereby realizing the adjustment of the striker stroke, improving the adjustment efficiency, and avoiding the problem that the sealing performance of the injection chamber is affected after frequent adjustment of the nozzle in the existing method of adjusting the striker stroke by adjusting the nozzle. Further, the present invention improves the nozzle installation structure, enabling the nozzle to be installed on the base through the second support, and one end of the base is hinged to the frame through the first support, and the other end is detachably fixed to the frame through the locking mechanism. After unlocking the locking mechanism for the first base, the nozzle can be replaced. Compared with the existing method of fixing the nozzle by the external thread of the guiding ring and the internal thread of the nozzle cap, the nozzle replacement process is simple and the replacement efficiency is relatively high.

[0022] 2. The present invention can dispense anaerobic glue with good sealing performance. Specifically, the injection chamber in the present invention is formed by surrounding the self-returning striker assembly, the nozzle, and the groove three opened on the second support between the self-returning striker assembly and the nozzle. The lower surface of the positioning piece of the self-returning striker assembly is in close contact with the second support under the action of various spring forces, and a first lip seal is provided between the nozzle and the second support, thereby making the injection chamber have good sealing performance. The self-returning striker of the self-returning striker assembly is made of ceramic material, the elastic diaphragm and the positioning piece of the self-returning striker assembly are both made of silicone, FKM, FFKM, or EPDM material, and the second support and the nozzle are both made of ABS or POM material. Each material does not react with the anaerobic glue, so that the present invention can realize the dispensing of anaerobic glue.

[0023] 3. In the present invention, the displacement amplification mechanism, the adjusting rod, the arc-shaped spring piece, and the support beam are integrally formed and symmetrically designed about the same axis, reducing the manufacturing cost. When the piezoelectric stack amplifies the displacement, it can avoid the lateral displacement of the ball-headed striker, improving the centering degree of the striker, and further improving the consistency of the glue dispensing of the dispensing valve. Description of the Drawings

[0024] Figure 1 is the three-dimensional view of the overall structure of the present invention;

[0025] Figure 2 is a cross-sectional view of the present invention;

[0026] Figure 3 is Figure 2 an enlarged view of part A in;

[0027] Figure 4 is a schematic structural view of the self-resetting striker assembly in the present invention;

[0028] Figure 5 is a front view of the present invention;

[0029] Figure 6 is Figure 5 a partial sectional view taken along A-A in. Detailed implementation manners

[0030] The present invention will be further described below with reference to the accompanying drawings.

[0031] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 shown, a piezoelectric drive type dispensing valve for anaerobic adhesive of the present invention includes a liquid storage cylinder 1, a base 5, a first support 6, a first compression spring 7, a flat head striker 8, a ball head striker 9, a piezoelectric stack 10, a displacement amplification mechanism 11-1, an adjusting rod 11-2, an arc-shaped spring piece 11-3, a frame 12, an adjusting bolt 14, a first guide sleeve 20, a second guide sleeve 22, a second support 24, a self-resetting striker assembly, a nozzle 26 and a third guide sleeve 29.

[0032] The displacement amplification mechanism 11-1, the adjusting rod 11-2, the arc-shaped spring piece 11-3 and the support beam 11-4 are integrally formed and are all arranged inside the frame 12; the support beam 11-4 is fixed to the upper end of the frame 12, and a vertically arranged through hole one is provided in the middle of the support beam 11-4. Both ends of the arc-shaped spring piece 11-3 with a convex arc surface are connected to the support beam 11-4, and the middle part is connected to the upper end of the displacement amplification mechanism 11-1 through the adjusting rod 11-2. The displacement amplification mechanism 11-1 is a rectangular frame elastic member, and a ball head striker 9 arranged coaxially with the through hole one is fixed to the lower end of the displacement amplification mechanism 11-1. The guide sleeve one 20 is fixed inside the through hole one. A threaded hole arranged coaxially with the through hole one is provided at the upper end of the frame 12. The vertically arranged adjusting bolt 14 is threadedly connected to the threaded hole and passes through the guide sleeve one 20 to contact the arc-shaped spring piece 11-3. The guide sleeve one 20 is used to restrict the adjusting bolt 14 to move in the vertical direction. The piezoelectric stack 10 is horizontally arranged inside the displacement amplification mechanism 11-1, and both ends of the piezoelectric stack 10 are fixed to both sides of the displacement amplification mechanism 11-1 through two fastening bolts one. Among them, when installing the piezoelectric stack 10, a pre-tightening force is applied to both ends of the piezoelectric stack 10 by tightening the two fastening bolts one, omitting an additional pre-tightening mechanism for the piezoelectric stack 10, making the force and displacement output by the piezoelectric stack more stable.

[0033] A step hole one arranged coaxially with the threaded hole is provided at the lower end of the frame 12. The horizontally arranged support one 6 is detachably fixed to the lower end of the frame 12, and a step hole two arranged coaxially with the step hole one is provided in the middle of the support one 6. The guide sleeve two 22 is sleeved inside the step hole one. The guide sleeve three 29 is placed inside the step hole two and is in close contact with the guide sleeve two 22, and the guide sleeve two 22 is pressed by the guide sleeve three 29 inside the step hole one; the flat head striker 8 is located directly below the ball head striker 9, and the lower end of the flat head striker 8 passes through the guide sleeve two 22 and penetrates into the upper end of the guide sleeve three 29, forming a sliding pair with both the upper end of the guide sleeve three 29 and the guide sleeve two 22, and the upper end is connected to the lower end of the frame 12 through a compression spring one 7.

[0034] One end of the base 5 is hinged to the first support 6. A stepped hole three is provided in the middle. A groove one is provided at the other end and is detachably fixed to the frame 12 through a locking mechanism. The specific connection method between the base 5 and the frame 12 is as follows: The locking mechanism includes a first pin 16 and a second compression spring 17. A support 3 is fixed to the side of the frame 12 away from the hinged position of the base 5 and the first support 6 through a second fastening bolt 18, and a first through groove is provided. Second through grooves and third through grooves are provided on both sides of the first through groove, and the third through groove is closer to the support 3 than the second through groove. The first pin 16 passes through the first through groove and forms a horizontal sliding pair with the first through groove. The second compression spring 17 is placed in the third through groove, and both ends of the second compression spring 17 are in contact with the first pin 16 and the support 3. A block is integrally formed in the middle of the first pin 16. The block passes through the second through groove and is embedded in the groove one. The second support 24 is placed in the stepped hole three. A groove two is provided at the upper end of the second support 24. A groove three is provided at the bottom surface of the groove two. A stepped hole four is provided at the bottom surface of the groove three. The nozzle 26 is (fixed by fitting) in the stepped hole four, and a first lip seal 27 is provided between the nozzle 26 and the stepped hole four. The first lip seal 27 is used to prevent the glue from leaking downward from the outside of the nozzle 26. The self-resetting striker assembly includes a self-resetting striker 25-1, an elastic diaphragm 25-2, and a positioning piece 25-3. The positioning piece 25-3 is placed in the groove two. The outer edge of the elastic diaphragm 25-2 is fixed to the first circular hole provided on the positioning piece 25-3. The middle of the self-resetting striker 25-1 is fixed to the second circular hole provided on the elastic diaphragm 25-2. The upper end penetrates into the lower end of the third guide sleeve 29 and forms a sliding pair with the lower end of the third guide sleeve 29. The lower end is located in the spray cavity 31 formed by enclosing the groove three, the self-resetting striker assembly, and the nozzle 26. The liquid storage cylinder 1 is fixed to the frame 12 and is communicated with the spray cavity 31 through a glue pipeline 2.

[0035] Among them, the arc-shaped reed 11-3, the first compression spring 7, the second compression spring 17, and the elastic diaphragm 25-2 are all in a compressed state. The top end of the flat-headed striker 8 contacts the bottom end of the ball-headed striker 9, the top end of the self-resetting striker 25-1 contacts the bottom end of the flat-headed striker 8, and the upper and lower ends of the displacement amplification mechanism 11-1 are recessed inward. The lower surface of the positioning piece 25-3 is in close contact with the bottom surface of the second groove; the self-resetting striker 25-1 is made of ceramic material, and the elastic diaphragm 25-2 and the positioning piece 25-3 are made of silica gel, FKM, FFKM or EPDM. The second guide sleeve 22, the first support 6, the second support 24, and the nozzle 26 are all made of ABS or POM material (engineering plastic) to adapt to the dispensing of anaerobic glue; a second lip seal 23 is provided between the flat-headed striker 8 and the third guide sleeve 29, and a third lip seal 28 is provided between the first support 6 and the third guide sleeve 29. The second lip seal 23 and the third lip seal 28 are used to prevent the glue from further leaking upward after the elastic diaphragm 25-2 is fatigued and damaged; the assembly composed of the displacement amplification mechanism 11-1, the adjusting rod 11-2, the arc-shaped reed 11-3, and the support beam 11-4 is symmetric about the central axis of the first through hole on both sides, so that when the piezoelectric stack performs displacement amplification, the lateral displacement of the ball-headed striker 9 can be avoided, the centering degree of the self-resetting striker 25-1 is improved, and the consistency of the glue dispensing of the dispensing valve is further improved.

[0036] As a preferred embodiment, both ends of the support beam 11-4 are fixed to the frame 12 by the third fastening bolt 19-1 and the fourth fastening bolt 19-2.

[0037] As a preferred embodiment, both ends of the first support 6 are fixed to the frame 12 by the fifth fastening bolt 21-1 and the sixth fastening bolt 21-2.

[0038] As a preferred embodiment, two vertical holes are arranged at intervals on the upper surface of the first support 6, two through holes two are arranged at intervals on the frame 12, and each through hole two is aligned with a vertical hole. The two through holes two are respectively fixed to the corresponding vertical holes by the first positioning pin 30-1 and the second positioning pin 30-2 for positioning the first support 6.

[0039] As a preferred embodiment, the hinged manner of the base 5 and the first support 6 is: the base 5 and the first support 6 form a rotating pair through the second pin shaft 4.

[0040] As a preferred embodiment, a convex platform is integrally formed on the upper surface of the positioning piece 25-3, and a fourth groove is opened on the lower surface of the first support 6. The convex platform is embedded in the fourth groove to position the positioning piece 25-3, thereby preventing the self-resetting striker 25-1 from having interference movements in the horizontal and vertical directions.

[0041] As a preferred embodiment, a support frame 15 is fixed to a side of the frame 12 away from the first pin shaft 16, and a wire harness interface 13 is provided between the frame 12 and the support frame 15. The wire harness interface 13 is fixed to the frame 12 and the support frame 15 and is connected by an electric wire to supply power from the outside through the wire harness interface 13.

[0042] As a preferred embodiment, the sliding pair in the horizontal direction formed by the first pin shaft 16 and the first through groove is replaced with a cylindrical pair formed by the first pin shaft 16 and the first through groove, the height of the second through groove is greater than the thickness of the clamping block, the height of the first groove is also greater than the thickness of the clamping block or the bottom of the first groove is open, the clamping block presses against the top wall surface of the first groove, the base 5 and the first support 6 are pressed tightly, and the second support 24 is pressed between the base 5 and the first support 6. Both ends of the first pin shaft 16 are connected with two nuts 32 by threads, and the side part of the nut 32 is provided with an opening and is connected with the cylindrical surface of the first pin shaft 16 by a set screw, and the nut 32 presses against the frame 12.

[0043] The working method of the piezoelectric-driven dispensing valve of the anaerobic adhesive of the present invention is as follows:

[0044] Inject the anaerobic adhesive into the liquid storage cylinder 1 (pressure is applied in the liquid storage cylinder 1), the anaerobic adhesive flows from the liquid storage cylinder 1 into the spraying cavity 31 through the adhesive liquid pipeline 2, the piezoelectric stack 10 is alternately powered on and off, so that the piezoelectric stack 10 deforms, driving the upper and lower ends of the displacement amplification mechanism 11-1 to alternately arch outwards and retract inwards, thereby driving the ball head impact pin 9 to move downwards and upwards reciprocally; when the ball head impact pin 9 moves downwards, the ball head impact pin 9 drives the self-resetting impact pin 25-1 to move downwards through the flat head impact pin 8, contacts the nozzle 26, and extrudes the anaerobic adhesive in the spraying cavity 31, so that the anaerobic adhesive in the spraying cavity 31 is extruded from the glue outlet of the nozzle 26, and at the same time, the first compression spring 7 and the elastic diaphragm 25-2 are further compressed; when the ball head impact pin 9 moves upwards, the restoring force of the first compression spring 7 drives the flat head impact pin 8 to move upwards, so that the top end of the flat head impact pin 8 is always in contact with the bottom end of the ball head impact pin 9, and at the same time, the restoring force of the elastic diaphragm 25-2 drives the self-resetting impact pin 25-1 to move upwards, so that the top end of the self-resetting impact pin 25-1 is always in contact with the bottom end of the ball head impact pin 9, the self-resetting impact pin 25-1 is separated from the nozzle 26, and the anaerobic adhesive in the liquid storage cylinder 1 enters the spraying cavity 31 through the adhesive liquid channel 8 to refill the spraying cavity 31.

[0045] Among them, when the striker stroke needs to be adjusted, the adjustment process is as follows: Turn the adjusting bolt 14 to move the adjusting bolt 14 downward or upward. When the adjusting bolt 14 moves downward, it pushes the arc-shaped spring piece 11-3 to be further compressed downward, and through the arc-shaped spring piece 11-3, it pushes the adjusting rod 11-2, the displacement amplification mechanism 11-1 and the piezoelectric stack 10 to move downward as a whole, and then pushes the ball head striker 9, the flat head striker 8 and the striker body 25-1 to move downward synchronously, so that the distance between the self-resetting striker 25-1 and the nozzle 26 is reduced, and thus the striker stroke is reduced. At the same time, the first compression spring 7 and the elastic diaphragm 25-2 are both further compressed. When the adjusting bolt 14 moves upward, the restoring force of the arc-shaped spring piece 11-3 drives the adjusting rod 11-2, the displacement amplification mechanism 11-1 and the piezoelectric stack 10 to move upward as a whole, and the restoring force of the first compression spring 7 drives the flat head striker 8 to move upward, so that the top end of the flat head striker 8 is always in contact with the bottom end of the ball head striker 9. At the same time, the restoring force of the elastic diaphragm 25-2 drives the self-resetting striker 25-1 to move upward, so that the top end of the self-resetting striker 25-1 is always in contact with the bottom end of the ball head striker 9, and thus the distance between the self-resetting striker 25-1 and the nozzle 26 is increased, and the striker stroke is increased.

[0046] When the nozzle 26 needs to be replaced, if the pin shaft 16 and the first through groove form a horizontal sliding pair, the replacement process is as follows: Pull the pin shaft 16 in the direction away from the base 5, the pin shaft 16 drives the clamping block to disengage from the first groove, the second compression spring 17 is further compressed, and the end of the base 5 provided with the first groove is unlocked. Then rotate the base 5 downward, release the pin shaft 16, and the pin shaft 16 drives the clamping block back to its original position under the action of the restoring force of the second compression spring 17. Then remove the self-resetting striker assembly and the nozzle 26, install the new nozzle 26 into the fourth stepped hole, and install the self-resetting striker assembly in place. Pull the pin shaft 16 in the direction away from the base 5, rotate the base 5 upward to its original position, release the pin shaft 16, and the clamping block re-embeds into the first groove, thereby realizing the replacement of the nozzle 26. If the pin shaft 16 and the first through groove form a cylindrical pair, the replacement process is as follows: Unscrew the set screws on the two nuts 32 and loosen the two nuts 32. Pull the pin shaft 16 in the direction away from the base 5, the pin shaft 16 drives the clamping block to disengage from the first groove, the second compression spring 17 is further compressed, and the end of the base 5 provided with the first groove is unlocked. Then rotate the base 5 downward, release the pin shaft 16, and the pin shaft 16 drives the clamping block back to its original position under the action of the restoring force of the second compression spring 17. Then remove the self-resetting striker assembly and the nozzle 26, install the new nozzle 26 into the fourth stepped hole, and install the self-resetting striker assembly in place. Pull the pin shaft 16 in the direction away from the base 5, rotate the base 5 upward to its original position, release the pin shaft 16, and the clamping block re-embeds into the first groove, pressing the top wall surface of the first groove, so that the base 5 and the first support 6 are pressed tightly, and the second support 24 is pressed between the base 5 and the first support 6. Finally, tighten the two nuts 32 and press them against the frame 12, and drill holes in the side of the nuts 32 to screw in the set screws.

Claims

1. A piezoelectric driven dispensing valve for anaerobic adhesive, comprising a flat-head striker, a piezoelectric stack, a displacement amplification mechanism, a frame and a nozzle, characterized in that: It also includes a base, a support seat 1, a ball head striker, an adjustment rod, an arc-shaped spring leaf, a support beam, an adjustment bolt, a support seat 2 and a self-resetting striker assembly; the displacement amplification mechanism, the adjustment rod, the arc-shaped spring leaf and the support beam are integrally formed and are all arranged in the frame; the support beam is fixed to the upper end of the frame, and a vertical through hole 1 is provided in the middle of the support beam, both ends of the convex arc-shaped spring leaf on the arc surface are connected to the support beam, and the middle part is connected to the upper end of the displacement amplification mechanism through the adjustment rod, and the lower end of the displacement amplification mechanism is fixed with a ball head striker arranged coaxially with the through hole; a guide sleeve 1 is fixed in the through hole 1, and a threaded hole arranged coaxially with the through hole is provided at the upper end of the frame, and the vertically arranged adjustment bolt is connected to the threaded hole through a thread, and passes through the guide sleeve 1 to contact the arc-shaped spring leaf; the piezoelectric stack is horizontally arranged in the displacement amplification mechanism, and both ends are fixed to the two sides of the displacement amplification mechanism, and the piezoelectric stack is provided with a pre-tightening force; The lower end of the frame is provided with a step hole 1 which is coaxially arranged with the threaded hole, a horizontally arranged support 1 is detachably fixed to the lower end of the frame, and a step hole 2 which is coaxially arranged with the step hole is provided in the middle of the support 1, the guide sleeve 2 is sleeved in the step hole 1, the guide sleeve 3 is placed in the step hole 2 and contacts with the guide sleeve 2, and the guide sleeve 2 is pressed into the step hole 1 by the guide sleeve 3; the flat head striker is located directly below the ball head striker, and the lower end of the flat head striker passes through the guide sleeve 2 and penetrates into the upper end of the guide sleeve 3, forming a sliding pair with the upper end of the guide sleeve 3 and the guide sleeve 2, and the upper end is connected to the lower end of the frame through a compression spring 1; One end of the base is hinged to the support one, a step hole three is opened in the middle, and a groove one is opened at the other end, and it is detachably fixed to the frame through a locking mechanism; the support two is placed in the step hole three, and the upper end of the support two is opened with a groove two, the bottom surface of the groove two is opened with a groove three, and the bottom surface of the groove three is opened with a step hole four, the nozzle is fixed in the step hole four, and a flood plug one is provided between the nozzle and the step hole four; the self-resetting striker assembly includes a self-resetting striker, an elastic diaphragm and a positioning plate, the positioning plate is placed in the groove two, the outer edge of the elastic diaphragm is fixed to the circular hole one opened on the positioning plate, and the middle part of the self-resetting striker is fixed to the elastic diaphragm The circular hole two opened on it is fixed, and the upper end penetrates into the lower end of the guide sleeve three, forming a sliding pair with the lower end of the guide sleeve three, and the lower end is located in the spray chamber formed by the groove three, the self-resetting striker assembly and the nozzle; the liquid storage cylinder is connected with the spray chamber; wherein, the top end of the flat-head striker contacts the bottom end of the ball-head striker, the top end of the self-resetting striker contacts the bottom end of the flat-head striker, and the lower surface of the positioning plate contacts the bottom surface of the groove two; the self-resetting striker is made of ceramic material, the elastic diaphragm and the positioning plate are made of silicone, FKM, FFKM or EPDM material, and the guide sleeve two, the support one, the support two and the nozzle are all made of ABS or POM material.

2. The piezoelectrically driven dispensing valve for anaerobic adhesive according to claim 1, characterized in that: The two sides of the assembly consisting of the displacement amplification mechanism, the adjustment rod, the arc-shaped spring leaf and the support beam are symmetrical about a central axis of the through hole.

3. The piezoelectrically driven dispensing valve for anaerobic adhesive according to claim 2, characterized in that: The connection method between the base and the frame is as follows: a locking mechanism includes a pin shaft 1 and a compression spring 2, a bracket is fixed to the side of the frame away from the hinged position of the base and the support 1, and a through slot 1 is opened, through slots 2 and 3 are opened on both sides of through slot 1, and through slot 3 is closer to the bracket than through slot 2, the pin shaft 1 passes through through slot 1 and forms a horizontal sliding pair with through slot 1, the compression spring 2 is placed in through slot 3, and the two ends of the compression spring 2 are in contact with the pin shaft 1 and the bracket, and an integrally formed card block is provided in the middle of the pin shaft 1, the card block passes through through slot 2, and is embedded in groove 1.

4. The piezoelectrically driven dispensing valve for anaerobic adhesive according to claim 3, characterized in that: The horizontal sliding pair formed by the pin shaft 1 and the through groove 1 is replaced by a cylindrical pair formed by the pin shaft 1 and the through groove 1, and the height of the through groove 2 is greater than the thickness of the block, the height of the groove 1 is also greater than the thickness of the block or the bottom of the groove 1 is open, the block presses the top wall of the groove 1, the base and the support 1 are pressed, and the support 2 is pressed between the base and the support 1, the two ends of the pin shaft 1 are connected with two nuts by threads, and the side opening of the nut is connected to the cylindrical surface of the pin shaft 1 by a set screw, and the nut presses the frame.

5. The piezoelectrically driven dispensing valve for anaerobic adhesive according to any one of claims 1 to 4, characterized in that: The upper surface of the support is provided with two vertical holes arranged at intervals, and the frame is provided with two through holes 2 arranged at intervals, and each through hole 2 is aligned with a vertical hole, and the two through holes 2 are fixed to the corresponding vertical holes by positioning pins 1 and 2 respectively.

6. A piezoelectrically driven dispensing valve for anaerobic adhesive according to any one of claims 1 to 4, characterized in that: The base and the support 1 are hinged in such a way that the base and the support 1 form a rotating pair through a pin 2.

7. A piezoelectrically driven dispensing valve for anaerobic adhesive according to any one of claims 1 to 4, characterized in that: An integrally formed boss is disposed on the upper surface of the positioning piece, and a groove four is formed on the lower surface of the support one, and the boss is embedded in the groove four.

8. The piezoelectrically driven dispensing valve for anaerobic adhesive according to any one of claims 1 to 4, characterized in that: A second wide plug is arranged between the flat head striker and the third guide sleeve, and a third wide plug is arranged between the first support and the third guide sleeve.

9. The working method of the piezoelectric driven dispensing valve of anaerobic adhesive according to claim 3 or 4, characterized in that: The details are as follows: The anaerobic adhesive is injected into the liquid storage cylinder, and the anaerobic adhesive flows from the liquid storage cylinder into the spray chamber through the adhesive pipeline. The piezoelectric stack is powered on and off repeatedly, causing the piezoelectric stack to deform, driving the upper and lower ends of the displacement amplification mechanism to arch outward and retract inward reciprocatingly, thereby driving the ball head striker to reciprocate downward and upward; when the ball head striker moves downward, the ball head striker drives the self-resetting striker to move downward through the flat head striker, contacts the nozzle, and squeezes the anaerobic adhesive in the spray chamber, so that the anaerobic adhesive in the spray chamber is ejected from the nozzle. The glue outlet of the nozzle is extruded, and the compression spring 1 and the elastic diaphragm are further compressed; when the ball head striker moves upward, the restoring force of the compression spring 1 drives the flat head striker to move upward, so that the top of the flat head striker is always in contact with the bottom of the ball head striker, and at the same time, the restoring force of the elastic diaphragm drives the self-resetting striker to move upward, so that the top of the self-resetting striker is always in contact with the bottom of the ball head striker, and the self-resetting striker is separated from the nozzle, and the anaerobic glue in the liquid storage cylinder enters the spray chamber through the glue liquid channel to refill the spray chamber; Among them, when it is necessary to adjust the stroke of the striker, the adjustment process is as follows: screw the adjusting bolt to make the adjusting bolt move downward or upward. When the adjusting bolt moves downward, the arc-shaped spring is pushed to be further compressed downward, and the adjusting rod, the displacement amplification mechanism and the piezoelectric stack are pushed downward as a whole through the arc-shaped spring, thereby pushing the ball head striker, the flat head striker and the striker body to move downward synchronously, so that the distance between the self-resetting striker and the nozzle is reduced, thereby reducing the striker stroke. At the same time, the compression spring 1 and the elastic diaphragm are further compressed. When the adjusting bolt moves upward, the restoring force of the arc-shaped spring drives the adjusting rod, the displacement amplification mechanism and the piezoelectric stack to move upward as a whole. The restoring force of the compression spring 1 drives the flat head striker to move upward, so that the top end of the flat head striker is always in contact with the bottom end of the ball head striker. At the same time, the restoring force of the elastic diaphragm drives the self-resetting striker to move upward, so that the top end of the self-resetting striker is always in contact with the bottom end of the ball head striker, thereby increasing the distance between the self-resetting striker and the nozzle, and increasing the striker stroke.

10. The working method of the piezoelectric driven dispensing valve of anaerobic adhesive according to claim 9, characterized in that: When the nozzle needs to be replaced, if the pin shaft 1 and the through slot 1 form a horizontal sliding pair, the replacement process is: pull the pin shaft 1 to move away from the base, the pin shaft 1 drives the block to disengage from the groove 1, the compression spring 2 is further compressed, and the end of the base with the groove 1 is unlocked, and then the base is rotated downward to release the pin shaft 1. The pin shaft 1 drives the block back to its original position under the action of the restoring force of the compression spring 2, and then the self-resetting striker assembly and the nozzle are removed, and the new nozzle is installed into the step hole 4, and the self-resetting striker assembly is installed in its original position, and the pin shaft 1 is pulled away from the base. Move, rotate the base upward to its original position, release the pin shaft 1, and the block is re-embedded in the groove 1, thereby completing the replacement of the nozzle; if the pin shaft 1 and the through slot 1 form a cylindrical pair, the replacement process is: unscrew the locking screws on the two nuts and loosen them Two nuts, pull pin shaft 1 to move away from the base, pin shaft 1 drives the block out of groove 1, compression spring 2 is further compressed, the end of the base with groove 1 is unlocked, then rotate the base downward, release pin shaft 1, pin shaft 1 drives the block back to its original position under the action of the restoring force of compression spring 2, then remove the self-resetting striker assembly and nozzle, install the new nozzle into step hole 4, and install the self-resetting striker assembly to its original position, pull pin shaft 1 to move away from the base, rotate the base upward to its original position, release pin shaft 1, and the block is re-embedded in groove 1, so that the block is pressed against the top wall of groove 1, thereby pressing the base and support 1, and support 2 is pressed between the base and support 1, finally tighten the two nuts and press them against the frame, and screw the locking screw into the hole on the side of the nut.

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